In a 4-6 quart slow cooker combine onion, garlic, chicken, lemon-pepper oregano and allspice. MIX and ensure chicken is coated with seasoning.,Cover and cook on low for 6-8 hours.,About 10 minutes before serving, heat pita bread as directed on package.,Remove chicken from slow cooker and pull apart with fork if needed (it will probably fall apart on it's own).,Stir yogurt into onion mixture,______